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相关概念视频

Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
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相关实验视频

Updated: Jan 24, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
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折射手术

Tae-Im Kim1, Jorge L Alió Del Barrio2, Mark Wilkins3

  • 1Department of Ophthalmology, The Institute of Vision Research, Yonsei University College of Medicine, Seoul, South Korea.

Lancet (London, England)
|May 21, 2019
PubMed
概括
此摘要是机器生成的。

现在除了激光外, 折射手术还提供了多种视力纠正的方法. 像小切割镜片提取和未来植入等先进技术为各种折射误差提供了个性化解决方案.

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科学领域:

  • 眼科 眼科
  • 角膜外科手术
  • 折射误差的纠正

背景情况:

  • 折射手术已经远远超出了传统的激光技术.
  • 像LASIK,LASEK和PRK这样的既定程序为低到中度的折射误差提供安全有效的视觉结果.
  • 现在有更多的手术选择来治疗各种折射状况.

研究的目的:

  • 审查折射手术的发展和现状.
  • 突出突破错误的手术技术的进展.
  • 讨论新出现的和未来的折射手术选择.

主要方法:

  • 对当前的激光折射手术程序进行审查.
  • 讨论小切割镜片提取 (SMILE) 和它的好处.
  • 探索未来的技术,包括角膜内植入物,眼内透镜和折射透镜交换.

主要成果:

  • 激光在位角膜切除术 (LASIK),激光上皮角膜切除术 (LASEK) 和光折射性角膜切除术 (PRK) 对于轻度至中度的角膜切除术是安全有效的.
  • 小切口镜片提取 (SMILE) 提供了诸如增强角膜强度和减少眼睛干燥等潜在优势.
  • 在被选中的患者中,光学眼内植入物和折射性透镜交换是可行的.

结论:

  • 折射手术已经扩展到包括各种各样的技术.
  • 在选择适当的折射校正时,患者的风险-益处概况是指导因素.
  • 未来的创新有望在治疗超视,近视和高折射误差方面取得进一步的进步.